In recent years, as portable electron equipment especially of the mobile telephone gain ground increasingly, in civil aviation implement on the phenomenon of use mobile telephone and other electron equipment also is added with each passing day much, already constituted menace to flight safety. A large number of evidence show aboard uses the portable electron equipment such as the mobile telephone to be able to generate electromagnetism interference, cause system of plane navigational aid, autopilot to be out of order to endanger aviation security badly then. Especially aerostat radio navigation and communication system are taking off, climb, into mix nearly land level, because aerostat is in low height, any electromagnetism interference are caused likely machine the consequence that destroys a person to die. This problem already caused the wide attention of social all circles